LG Air Conditioner
LG AC CH09 error
Memory (EEPROM) error — indoor unit board
Try a reset once. If it comes back, a trained technician should repair it.
Also shown as: 09
What it means
The indoor unit board cannot read its saved settings from its memory chip (EEPROM). This is an electronic fault on the board.
Common causes
- Power surge or lightning
- Data corrupted after a power cut
- Faulty memory chip or control board
Try this at home first
Tick each step as you go
When to call a technician
If the code stays, the control board must be repaired or replaced by an authorised technician.
Safety first
Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.
Frequently asked questions
What does CH09 mean on a LG Air Conditioner?
Memory (EEPROM) error — indoor unit board. The indoor unit board cannot read its saved settings from its memory chip (EEPROM). This is an electronic fault on the board.
Can I fix LG Air Conditioner error CH09 myself?
You can try a reset first: Switch off at the MCB for 10 minutes and restart once. If the code returns, call a technician.
Is it safe to keep using the Air Conditioner with CH09?
Avoid repeated restarts; running with this fault can cause more damage.
Other LG AC codes
Sources
We write every explanation in our own words from these references.
Last checked: 2026-10-20